Measurement of the properties of the Ξ [subscript b][superscript ∗ 0] baryon
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13130_2016_Article_4044.pdf
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Author(s)
Aaij, R.
Abellán Beteta, C.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Alternative Title
Measurement of the properties of the Ξb∗ 0 baryon
Date Issued
May 2016
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration et al. “Measurement of the Properties of the Ξ B ∗ 0 Baryon.” Journal of High Energy Physics 2016.5 (2016): n. pag.
Version
Final published version
Abstract
We perform a search for near-threshold Ξ[subscript b][superscript 0] resonances decaying to Ξ[subscript b−π][superscript +] in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb[superscript −1] collected by the LHCb experiment. We observe one resonant state, with the following properties:
m(Ξ[superscript ∗0][superscript b]) − m(Ξ[superscript −][subscript b])− m(π[superscript +]) = 15.727±0.068(stat)±0.023(syst)MeV/c[superscript 2]Γ(Ξ[superscript ∗0][subscript b]) = 0.90±0.16(stat)±0.08(syst)MeV.
This confirms the previous observation by the CMS collaboration. The state is consistent with the J[superscipt P] = 3/2[superscript +] Ξ[superscript b][superscript ∗ 0] resonance expected in the quark model. This is the most precise determination of the mass and the first measurement of the natural width of this state. We have also measured the ratio
σ(pp→Ξ[superscript ∗0][subscript b]X)B(Ξ[superscript ∗0][subscript b] → Ξ[superscript −][subscript b]π[superscript +])/σ(pp→Ξ[superscipt −][subscript b]X) = 0.28±0.03(stat.)±0.01(syst.).
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
http://dx.doi.org/10.1007/JHEP05(2016)161
